Note 16 - Income Taxes - Reconciliation Statutory Income Tax Rates (Details)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Applicable statutory rate	21.00%	21.00%
Tax-exempt interest and dividends, net	(1.10%)	(1.80%)
State income taxes, net of Federal income tax benefit	2.10%	1.80%
Low-income housing and rehabilitation tax credits	(0.40%)	(0.30%)
Other, net	1.10%	(0.50%)
Effective income tax rate	22.70%	20.20%